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ReDoc is the responsive, three-panel, OpenAPI specification driven documentation for your API that you were looking for. Swagger UI is still reigning king when it comes to API documentation generated using the OpenAPI Spec, but ReDoc provides a simple, attractive, and clean alternative to documentation.

ReDoc is deployable to any web page with just two tags--with the resulting documentation looking attractive on both web and mobile devices. Now you can have it all, your API documentation looking good, interactive, and driven by a machine-readable definition that will help you keep everything up to date.

ReDoc leverages a custom HTML tag, and provides you with a handful of attributes for defining, and customizing their documentation, including specurl, scroll-y-offset, suppress-warnings, lazy-rendering, hid-hostname, and expand-responses--providing some quick ways to get exactly what you need, on any web page.

There is a handful of APIs who have put ReDocs to use as API documentation for their platform:

There also provide a live demo of ReDoc, allowing you to kick the tires some more before you deploy, and make sure it does what you will need it to before you fork.

ReDoc provides a simple, OpenAPI spec compliant way of delivering attractive, interactive, responsive and up to date documentation that can be deployed anywhere, including integration into your existing continuous integration, and API lifecycle. ReDoc reflects a new generation of very modular, plug and play API tooling that can be put to use immediately as part of an OpenAPI Spec-driven web, mobile, and device application development cycle(s).